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Northwest Africa 12242
Basic information Name: Northwest Africa 12242
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12242
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 101.7 g
Recommended:  CK3    [explanation]

This is 1 of 71 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 8 May 2022
Writeup from MB 111:

Northwest Africa 12242 (NWA 12242)


Purchased: 2018 May

Classification: Carbonaceous chondrite (CK3)

History: Found in Algeria and purchased by Darryl Pitt in May 2018 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Separated, unequilibrated chondrules (apparent diameter 1010±390 µm, N = 17) containing Cr-magnetite and Al-Ti-rich subcalcic augite together with rare fine grained CAI are set in a fine grained matrix (40 vol.%, deep orange in thin section) containing altered Cr-magnetite and calcite.

Geochemistry: (S. Kuehner, UWS and J. Boesenberg, BrownU) Olivine (Fa20.6±15.2, range Fa0.3-35.7, N = 8), subcalcic augite (Fs2.1Wo30.0, Al2O3 = 4.7 wt.%, TiO2 = 1.4 wt.%), augite (Fs11.8±3.9Wo49.1±0.5, range Fs7.4-15.1Wo48.6-49.6, N = 5), magnetite (Cr2O3 3.5±0.45 wt.%, range 2.7-3.9 wt.%, N = 9).

Classification: Carbonaceous chondrite (CK3). The Cr2O3 contents in magnetite are within the range for CK chondrites.

Specimens: 20.1 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018 May
Mass (g):101.7
Shock stage:S2
Weathering grade:moderate
Fayalite (mol%):0.3-35.0
Ferrosilite (mol%):2.1; 7.6
Wollastonite (mol%):30; 48.6
Classifier:A. Irving & S. Kuehner, UWS; J. Boesenberg, BrownU
Type spec mass (g):20.1
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 368; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 1194 approved meteorites from Algeria (plus 28 unapproved names) (plus 4 impact craters)

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